Is RDW SD 45.3 normal, high or low? What does RDW SD level 45.3 mean?

📅 Medical Review Date: September 26, 2025

Your RDW SD level of 45.3 is a Normal RDW SD level.

Normal RDW SD levels may indicate underlying health problems. The normal range is typically between 39 fL and 46 fL. If your levels are outside this range, it's important to speak with a healthcare provider. Consulting a doctor is recommended to determine the cause and appropriate next steps.

The normal RDW SD range for men is :39 - 46 fL

Ideal values of RDW SD depending on age (male) :

Age	Ideal RDW SD value
<5 years	40.767
5-10 years	42.614
10-15 years	44.544
15-20 years	44.453
20-25 years	44.362
25-30 years	44.271
30-35 years	44.18
35-40 years	44.089
40-45 years	43.998
45-50 years	45.991
50-55 years	45.896
55-60 years	45.802
60-70 years	45.708
70-80 years	45.615
80-90 years	45.521
90-100 years	45.427
>100 years	45.334

*Ideal values are calculated based on our database of patient records

Get Advice via Email : Send us your blood test report, and our RDW SD experts will review it. You'll receive a detailed analysis and personalized treatment guidance via email within 12 hours. If you have additional blood test results besides RDW SD, please include those too—an accurate diagnosis often requires a full view of all abnormalities. Upload blood test report now

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Some examples of conditions that increase or decrease RDW SD levels include:

• Thalassemia, an inherited blood disorder
• Crohn's disease
• Chronic liver disease
• An iron or vitamin deficiency
• Heart disease

Receive world-class medical opinion about your normal RDW SD levels over email.Upload blood test report now

Normal range of RDW SD found among women :39-46 fL

Ideal values of RDW SD depending on age (female) :

Age	Ideal RDW SD value
<5 years	40.82
5-10 years	42.725
10-15 years	44.719
15-20 years	44.622
20-25 years	44.525
25-30 years	44.428
30-35 years	44.331
35-40 years	44.234
40-45 years	44.138
45-50 years	44.041
50-55 years	43.945
55-60 years	45.995
60-70 years	45.895
70-80 years	45.795
80-90 years	45.696
90-100 years	45.596
>100 years	45.496

If you take a RDW SD blood test and the results are not in the normal range (39-46 fL), your physician may recommend more tests to figure out the problem. You might also get this test if your physician thinks you have some other disease.

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How the RDW SD Test Is Done :

When your doctor orders a RDW SD test, it involves a straightforward blood draw to measure your RDW SD levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your RDW SD test results are usually available within a few hours.

Medical References

• MedlinePlus – RDW (Red Cell Distribution Width)
• Cleveland Clinic – RDW Blood Test: What It Is, Procedure & Results
• NIH – RDW-SD is Superior to RDW-CV in Reflecting Liver Fibrosis Stage in Patients with Chronic Hepatitis B

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